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Where the pH is the lowest, corals can no longer grow - sand, rubble and seagrasses replace the reef.
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Lonely Seagrass in Acidic Waters

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Sargassum forms dense clumps up to the size of a beach ball that slowly rotate as they drift.
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Floating Sargassum Seaweed

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Kelps are large, brown algae that grow along coasts around the world, especially in cooler regions.
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Kelp Pennant

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Many species of pink coralline algae, which cements coral reefs together, cover a reef surface in the Southern Line Islands.
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Pink Coralline Algae

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spindles of magnified green algae
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A Cancer Fighter from the Sea

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Mangrove roots provide an underwater habitat for many marine species.
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Mangroves: Photos of Plants and Animals

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